| Phone Prefix | Range | Phones Recorded |
|---|---|---|
| (301) 574-10** | (301) 574-1001 - (301) 574-1099 | 60 |
| (301) 574-11** | (301) 574-1101 - (301) 574-1199 | 80 |
| (301) 574-12** | (301) 574-1201 - (301) 574-1299 | 70 |
| (301) 574-13** | (301) 574-1301 - (301) 574-1399 | 66 |
| (301) 574-14** | (301) 574-1400 - (301) 574-1499 | 70 |
| (301) 574-15** | (301) 574-1500 - (301) 574-1598 | 74 |
| (301) 574-16** | (301) 574-1601 - (301) 574-1699 | 67 |
| (301) 574-17** | (301) 574-1702 - (301) 574-1799 | 65 |
| (301) 574-18** | (301) 574-1802 - (301) 574-1899 | 56 |
| (301) 574-19** | (301) 574-1900 - (301) 574-1999 | 67 |
US Phone Directory: (301) 574-1***
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